Gravity Bridge, a Cosmos-native cross-chain protocol, was the target of a compromised-key attack, which led to the theft of roughly $5.4 million over the weekend. This latest security breach joins the growing list of exploits suffered in the decentralized finance (DeFi) space so far in 2026.
Gravity Bridge Hack Traced To Signing Key Compromise: Investigator
On Saturday, May 31st, blockchain sleuth Specter highlighted that Gravity Bridge might have been exploited through what he described as a signing key compromise. For context, a signing key compromise refers to the unauthorized disclosure or theft of a cryptographic key, allowing an attacker to then use it to decrypt sensitive information, forge digital signatures, or gain unauthorized access to systems and, as in this case, funds.
The analyst disclosed that the loot included crypto assets worth about $5..4 million, including $4.3 million in USDC, 274 wrapped Ether valued at roughly $553,000, $434,000 in USDT, and 14.16
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